(a) Financial Statements of Businesses Acquired.

• DTE Gas Resources, LLC unaudited balance sheets as of September 30, 2012 and December 31, 2011, statements of operations, equity and cash flows and notes to the financial statements for the nine months ended September 30, 2012 and 2011 are filed as Exhibit 99.1 to this Current Report on Form 8-K/A and are incorporated by reference herein.

• DTE Gas Resources, LLC audited balance sheet as of December 31, 2011, statements of operations, equity and cash flows and notes to the financial statements for the year ended December 31, 2011, together with independent auditors' report thereon, are filed as Exhibit 99.2 to this Current Report on Form 8-K/A and are incorporated by reference herein.

• Cardinal Midstream, LLC unaudited consolidated balance sheets as of September 30, 2012 and December 31, 2011, and consolidated statements of operations, members' interest and cash flows and notes to the financial statements for the nine months ended September 30, 2012 and 2011 are filed as Exhibit 99.3 to this Current Report on Form 8-K/A and are incorporated by reference herein.

• Cardinal Midstream, LLC audited consolidated balance sheet as of December 31, 2011, and consolidated statements of operations, members' interest and cash flows and notes to the financial statements for the year ended December 31, 2011, together with independent auditors' report thereon, are filed as Exhibit 99.4 to this Current Report on Form 8-K/A and are incorporated by reference herein.

The unaudited pro forma consolidated balance sheet of ATLS as of September 30, 2012, and the related pro forma consolidated combined statements of income for the nine months ended September 30, 2012 and the year ended December 31, 2011 are filed as Exhibit 99.5 to this Current Report on Form 8-K/A and are incorporated by reference herein.

(d) Exhibits

23.1    Consent of Grant Thornton LLP

23.2    Consent of Deloitte & Touche LLP

99.1    DTE Gas Resources, LLC unaudited balance sheets as of September 30, 2012
        and December 31, 2011, statements of operations, equity and cash flows and
        notes to the financial statements for the nine months ended September 30,
        2012 and 2011

99.2    DTE Gas Resources, LLC audited balance sheet as of December 31, 2011,
        statements of operations, equity and cash flows and notes to the financial
        statements for the year ended December 31, 2011, together with independent
        auditors' report thereon

99.3    Cardinal Midstream, LLC unaudited consolidated balance sheets as of
        September 30, 2012 and December 31, 2011, and consolidated statements of
        operations, members' interest and cash flows and notes to the financial
        statements for the nine months ended September 30, 2012 and 2011

99.4    Cardinal Midstream, LLC audited consolidated balance sheet as of December
        31, 2011, statements of operations, members' interest and cash flows and
        notes to the financial statements for the year ended December 31, 2011,
        together with independent auditors' report thereon

99.5    Unaudited pro forma consolidated combined financial statements